What is the meaning of the following traffic sign?

- No entry for non-motor vehicles only.
- Entry is permitted for tractors and work vehicles.
- Careful! road-works.
- Correct answer: No entry for tractors and work vehicles.
Why this is the answer
The correct answer in the official bank: No entry for tractors and work vehicles.
A round sign with a red border is a prohibition sign, and the symbol inside shows who the ban applies to. Here the symbol is a tractor, so tractors and work vehicles may not enter. It is not a road-works warning, because warning signs are triangular, and it does not permit entry, since a red ring means a ban.